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-rw-r--r--libavcodec/scpr.h365
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diff --git a/libavcodec/scpr.h b/libavcodec/scpr.h
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+++ b/libavcodec/scpr.h
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+/*
+ * ScreenPressor decoder
+ *
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_SCPR_H
+#define AVCODEC_SCPR_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "scpr3.h"
+
+typedef struct RangeCoder {
+ uint32_t code;
+ uint32_t range;
+ uint32_t code1;
+} RangeCoder;
+
+typedef struct PixelModel {
+ uint32_t freq[256];
+ uint32_t lookup[16];
+ uint32_t total_freq;
+} PixelModel;
+
+typedef struct SCPRContext {
+ int version;
+ AVFrame *last_frame;
+ AVFrame *current_frame;
+ GetByteContext gb;
+ RangeCoder rc;
+ PixelModel pixel_model[3][4096];
+ uint32_t op_model[6][7];
+ uint32_t run_model[6][257];
+ uint32_t range_model[257];
+ uint32_t count_model[257];
+ uint32_t fill_model[6];
+ uint32_t sxy_model[4][17];
+ uint32_t mv_model[2][513];
+ uint32_t nbx, nby;
+ uint32_t nbcount;
+ uint32_t *blocks;
+ uint32_t cbits;
+ int cxshift;
+
+ PixelModel3 pixel_model3[3][4096];
+ RunModel3 run_model3[6];
+ RunModel3 range_model3;
+ RunModel3 count_model3;
+ FillModel3 fill_model3;
+ SxyModel3 sxy_model3[4];
+ MVModel3 mv_model3[2];
+ OpModel3 op_model3[6];
+
+ int (*get_freq)(RangeCoder *rc, uint32_t total_freq, uint32_t *freq);
+ int (*decode)(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq);
+} SCPRContext;
+
+static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
+ int *px, int *py, uint32_t clr, uint32_t *dst,
+ int linesize, uint32_t *plx, uint32_t *ply,
+ uint32_t backstep, int off, int *cx, int *cx1)
+{
+ uint32_t r, g, b;
+ int z;
+ int x = *px,
+ y = *py;
+ uint32_t lx = *plx,
+ ly = *ply;
+
+ if (y >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ switch (ptype) {
+ case 0:
+ while (run-- > 0) {
+ dst[y * linesize + x] = clr;
+ lx = x;
+ ly = y;
+ (x)++;
+ if (x >= avctx->width) {
+ x = 0;
+ (y)++;
+ if (y >= avctx->height && run)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ break;
+ case 1:
+ while (run-- > 0) {
+ dst[y * linesize + x] = dst[ly * linesize + lx];
+ lx = x;
+ ly = y;
+ (x)++;
+ if (x >= avctx->width) {
+ x = 0;
+ (y)++;
+ if (y >= avctx->height && run)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ clr = dst[ly * linesize + lx];
+ break;
+ case 2:
+ if (y < 1)
+ return AVERROR_INVALIDDATA;
+
+ while (run-- > 0) {
+ clr = dst[y * linesize + x + off + 1];
+ dst[y * linesize + x] = clr;
+ lx = x;
+ ly = y;
+ (x)++;
+ if (x >= avctx->width) {
+ x = 0;
+ (y)++;
+ if (y >= avctx->height && run)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ break;
+ case 4:
+ if (y < 1 || (y == 1 && x == 0))
+ return AVERROR_INVALIDDATA;
+
+ while (run-- > 0) {
+ uint8_t *odst = (uint8_t *)dst;
+ int off1 = (ly * linesize + lx) * 4;
+ int off2 = ((y * linesize + x) + off) * 4;
+
+ if (x == 0) {
+ z = backstep * 4;
+ } else {
+ z = 0;
+ }
+
+ r = odst[off1] +
+ odst[off2 + 4] -
+ odst[off2 - z ];
+ g = odst[off1 + 1] +
+ odst[off2 + 5] -
+ odst[off2 - z + 1];
+ b = odst[off1 + 2] +
+ odst[off2 + 6] -
+ odst[off2 - z + 2];
+ clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
+ dst[y * linesize + x] = clr;
+ lx = x;
+ ly = y;
+ (x)++;
+ if (x >= avctx->width) {
+ x = 0;
+ (y)++;
+ if (y >= avctx->height && run)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ break;
+ case 5:
+ if (y < 1 || (y == 1 && x == 0))
+ return AVERROR_INVALIDDATA;
+
+ while (run-- > 0) {
+ if (x == 0) {
+ z = backstep;
+ } else {
+ z = 0;
+ }
+
+ clr = dst[y * linesize + x + off - z];
+ dst[y * linesize + x] = clr;
+ lx = x;
+ ly = y;
+ (x)++;
+ if (x >= avctx->width) {
+ x = 0;
+ (y)++;
+ if (y >= avctx->height && run)
+ return AVERROR_INVALIDDATA;
+ }
+ }
+ break;
+ }
+
+ *px = x;
+ *py = y;
+ *plx= lx;
+ *ply= ly;
+
+ if (avctx->bits_per_coded_sample == 16) {
+ *cx1 = (clr & 0x3F00) >> 2;
+ *cx = (clr & 0x3FFFFF) >> 16;
+ } else {
+ *cx1 = (clr & 0xFC00) >> 4;
+ *cx = (clr & 0xFFFFFF) >> 18;
+ }
+
+ return 0;
+}
+
+static int decode_run_p(AVCodecContext *avctx, uint32_t ptype, int run,
+ int x, int y, uint32_t clr,
+ uint32_t *dst, uint32_t *prev,
+ int linesize, int plinesize,
+ uint32_t *bx, uint32_t *by,
+ uint32_t backstep, int sx1, int sx2,
+ int *cx, int *cx1)
+{
+ uint32_t r, g, b;
+ int z;
+
+ switch (ptype) {
+ case 0:
+ while (run-- > 0) {
+ if (*by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ case 1:
+ while (run-- > 0) {
+ if (*bx == 0) {
+ if (*by < 1)
+ return AVERROR_INVALIDDATA;
+ z = backstep;
+ } else {
+ z = 0;
+ }
+
+ if (*by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ clr = dst[*by * linesize + *bx - 1 - z];
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ case 2:
+ while (run-- > 0) {
+ if (*by < 1 || *by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ clr = dst[(*by - 1) * linesize + *bx];
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ case 3:
+ while (run-- > 0) {
+ if (*by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ clr = prev[*by * plinesize + *bx];
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ case 4:
+ while (run-- > 0) {
+ uint8_t *odst = (uint8_t *)dst;
+
+ if (*by < 1 || *by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ if (*bx == 0) {
+ if (*by < 2)
+ return AVERROR_INVALIDDATA;
+ z = backstep;
+ } else {
+ z = 0;
+ }
+
+ r = odst[((*by - 1) * linesize + *bx) * 4] +
+ odst[(*by * linesize + *bx - 1 - z) * 4] -
+ odst[((*by - 1) * linesize + *bx - 1 - z) * 4];
+ g = odst[((*by - 1) * linesize + *bx) * 4 + 1] +
+ odst[(*by * linesize + *bx - 1 - z) * 4 + 1] -
+ odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 1];
+ b = odst[((*by - 1) * linesize + *bx) * 4 + 2] +
+ odst[(*by * linesize + *bx - 1 - z) * 4 + 2] -
+ odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 2];
+ clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ case 5:
+ while (run-- > 0) {
+ if (*by < 1 || *by >= avctx->height)
+ return AVERROR_INVALIDDATA;
+
+ if (*bx == 0) {
+ if (*by < 2)
+ return AVERROR_INVALIDDATA;
+ z = backstep;
+ } else {
+ z = 0;
+ }
+
+ clr = dst[(*by - 1) * linesize + *bx - 1 - z];
+ dst[*by * linesize + *bx] = clr;
+ (*bx)++;
+ if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
+ *bx = x * 16 + sx1;
+ (*by)++;
+ }
+ }
+ break;
+ }
+
+ if (avctx->bits_per_coded_sample == 16) {
+ *cx1 = (clr & 0x3F00) >> 2;
+ *cx = (clr & 0x3FFFFF) >> 16;
+ } else {
+ *cx1 = (clr & 0xFC00) >> 4;
+ *cx = (clr & 0xFFFFFF) >> 18;
+ }
+
+ return 0;
+}
+
+#endif /* AVCODEC_SCPR_H */
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